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[78.94.0.51]) by smtp.gmail.com with ESMTPSA id p9-20020a1c7409000000b003fee53feab5sm1799448wmc.10.2023.08.31.05.14.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 31 Aug 2023 05:14:15 -0700 (PDT) From: Naresh Solanki X-Google-Original-From: Naresh Solanki To: broonie@kernel.org, zev@bewilderbeest.net, Liam Girdwood Cc: Naresh Solanki , linux-kernel@vger.kernel.org Subject: [PATCH 2/3] regulator: userspace-consumer: Add regulator event support Date: Thu, 31 Aug 2023 14:14:09 +0200 Message-ID: <20230831121412.2359239-2-Naresh.Solanki@9elements.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230831121412.2359239-1-Naresh.Solanki@9elements.com> References: <20230831121412.2359239-1-Naresh.Solanki@9elements.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add sysfs attribute to track regulator events received from regulator notifier block handler. Signed-off-by: Naresh Solanki --- drivers/regulator/userspace-consumer.c | 54 +++++++++++++++++++++++++- 1 file changed, 53 insertions(+), 1 deletion(-) diff --git a/drivers/regulator/userspace-consumer.c b/drivers/regulator/userspace-consumer.c index 97f075ed68c9..a936661d99cd 100644 --- a/drivers/regulator/userspace-consumer.c +++ b/drivers/regulator/userspace-consumer.c @@ -29,6 +29,10 @@ struct userspace_consumer_data { int num_supplies; struct regulator_bulk_data *supplies; + + struct kobject *kobj; + struct notifier_block nb; + unsigned long events; }; static ssize_t name_show(struct device *dev, @@ -89,12 +93,30 @@ static ssize_t state_store(struct device *dev, struct device_attribute *attr, return count; } +static DEFINE_SPINLOCK(events_lock); + +static ssize_t events_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct userspace_consumer_data *data = dev_get_drvdata(dev); + unsigned long e; + + spin_lock(&events_lock); + e = data->events; + data->events = 0; + spin_unlock(&events_lock); + + return sprintf(buf, "0x%lx\n", e); +} + static DEVICE_ATTR_RO(name); static DEVICE_ATTR_RW(state); +static DEVICE_ATTR_RO(events); static struct attribute *attributes[] = { &dev_attr_name.attr, &dev_attr_state.attr, + &dev_attr_events.attr, NULL, }; @@ -115,12 +137,30 @@ static const struct attribute_group attr_group = { .is_visible = attr_visible, }; +static int regulator_userspace_notify(struct notifier_block *nb, + unsigned long event, + void *ignored) +{ + struct userspace_consumer_data *data = + container_of(nb, struct userspace_consumer_data, nb); + static const char * const *envp[] = { "NAME=events", NULL }; + + spin_lock(&events_lock); + data->events |= event; + spin_unlock(&events_lock); + + sysfs_notify(data->kobj, NULL, dev_attr_events.attr.name); + kobject_uevent_env(data->kobj, KOBJ_CHANGE, envp); + + return NOTIFY_OK; +} + static int regulator_userspace_consumer_probe(struct platform_device *pdev) { struct regulator_userspace_consumer_data tmpdata; struct regulator_userspace_consumer_data *pdata; struct userspace_consumer_data *drvdata; - int ret; + int i, ret; pdata = dev_get_platdata(&pdev->dev); if (!pdata) { @@ -153,6 +193,7 @@ static int regulator_userspace_consumer_probe(struct platform_device *pdev) drvdata->num_supplies = pdata->num_supplies; drvdata->supplies = pdata->supplies; drvdata->no_autoswitch = pdata->no_autoswitch; + drvdata->kobj = &pdev->dev.kobj; mutex_init(&drvdata->lock); @@ -186,6 +227,13 @@ static int regulator_userspace_consumer_probe(struct platform_device *pdev) } drvdata->enabled = !!ret; + drvdata->nb.notifier_call = regulator_userspace_notify; + for (i = 0; i < drvdata->num_supplies; i++) { + ret = devm_regulator_register_notifier(drvdata->supplies[i].consumer, &drvdata->nb); + if (ret) + goto err_enable; + } + return 0; err_enable: @@ -197,6 +245,10 @@ static int regulator_userspace_consumer_probe(struct platform_device *pdev) static int regulator_userspace_consumer_remove(struct platform_device *pdev) { struct userspace_consumer_data *data = platform_get_drvdata(pdev); + int i; + + for (i = 0; i < data->num_supplies; i++) + devm_regulator_unregister_notifier(data->supplies[i].consumer, &data->nb); sysfs_remove_group(&pdev->dev.kobj, &attr_group); -- 2.41.0